Heart rate belt



FIG. 1 is a first top perspective view of a heart rate belt;

FIG. 2 is a second top perspective view of the heart rate belt of FIG. 1;

FIG. 3 is a side view of the heart rate belt of FIG. 1; and,

FIG. 4 is a top view of the heart rate belt of FIG. 1.

The broken lines in the drawings are included for the purpose of illustrating portions of the heart rate belt that form no part of the claimed design. 

CLAIM We claim the ornamental design for a heart rate belt, as shown and described. 